drm/xe/guc: Cleanup GuC log buffer macros and helpers

drm/xe/guc: Cleanup GuC log buffer macros and helpers

Cleanup GuC log buffer macros and helpers, add Xe style macro prefix.
Update buffer type values to align with the GuC specification
Update buffer offset calculation.
Remove helper functions, replaced with macros.

Signed-off-by: Zhanjun Dong <zhanjun.dong@intel.com>
Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Link: https://patch.msgid.link/20251105233143.1168759-1-zhanjun.dong@intel.com